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FAIR VALUE MEASUREMENTS - Summary of fair value Level 3 debt - Term loan (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Carrying Amount
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Term loan $ 297,750 $ 300,000
Revolving credit facility 5,000  
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Term loan 291,676 293,125
Revolving credit facility $ 4,731